Rapid puncher and riveter



Nov. 24, 1931. J. c. HANNA 1,833,216

RAPID PUNCHER AND RIVETER Filed Dec. 14, 1925" 2'-sheets-Sheet 1 3 fig E l N Nov. 24, 1931. J. c. HANNA RAPID PUNCHER AND RIVETER Filed Dec. '14, 1925 2 Sheets-Sheet 2 NANA/A H Patented Nov. 24, 1231 Lanna carica- JOHN G. WEE, F GHICAGG, ILLINOIS, YASSIGNOR TO HANNA ENGINEERING WORKS. 9F CHICAGO, ILLINOIS, A CORPORATION OF'ILLINOIS RAPID EUNC' HER AND RIVET'ER Application filed. December 14, 1925. Serial No. 75,193..

This invention relatesto a new and im-' proved riveter construction and more partlcularly, to an apparatus adapted for use as a punch or riveter for rapid operatlon.

'5 It is an objectof the present invention to 19 tus adapted for rapid operation and continuous use with readily replaceable wearing parts.

It is an additional object, to provide a new and improved valve and cushioning arrangement for such riveters or the like.

It is also an object to provide apparatus of this character which is simple in design and construction and adapted .for commercial production. v

Other and further objects will appear as the description proceeds.

I have illustrated certain preferred embodiments of my invention in the accompanyin drawings. in which Figure 1 is an elevation partly in section of the riveter;

Figure 2 is a fragmentary section taken on line 2-2 of Figure 1;

Figure 3 is an enlarged cross showing the valve of Figure 1;

Fi re 4 is a section taken on line.44

section v of Figure 3;

bearing pin 18 which latter is fitted into the bearing 19 on the upper portion of the frame. v

The forward end of the lever 16 is recessed to receive the cylindrical bearing member 20 as shown in both Figures 1 and 2. The

plunger 21 is fitted into the bearings 22 and 23 carried by the frame 11. The upper end of the plunger is recessed toreceive the cylindrical bearing member 24. The bolts 25 and 26 which pass through the bearin members 20 and 24 engage the links 27 an 28, which thus serve. to connect the plunger and lever. The toggle member 29 is fitted between the c lindrical bearing members 20 and 24 an is provided with concave bearing surfaces engaging these members. As shown in Figure 1, the toggle member 29 is provided with the oil passages 30.

The lower end of the plunger 21 receives the die holder 31 which is retained in place by set-screw 32. This die holder is flared to give a large bearing on the end of the plunger. The stripper 33 is adjustably secured to the frame 11 by the bolt 34.

The cylinder 35 is pivotedly supported from the frame 11 by the pivot pin 36. The

upper end of the cylinder is closed by the cylinder head 37, which latter carries the gland 38 retaining in place the packing'39. The piston head 40 has secured thereto the piston rod 41, the upper end of which is pivotally connected to the lever 16 by pin 42. The follower 43 is fitted upon the reduced portion 44 of the piston rod and-the packing 45 is retained between the piston head 40 and follower. The sleeve 46 is fitted upon the piston rod 41 and its lower end bears upon the follower 43. The upper end of'the sleeve 46 is engaged by the nut 47 carried by the upper portion of the piston rod 41. The cylinder head 37 and the opposite end of the cylinder 35 each carries a cushion valve of the'type best shown in Figures 3 to 5. The valve member 51 is threaded into the cylinder member and the elbow connection 52 is threaded into the valve member. The split spring valve 53 is retained upon the outer surface of the member 51 by the lugs 54 and covers the ports 55. The sleeve valve 56 is carried inside the member 51 and is normally maintained in the position shown in Figure 3 by the spring 57, the opposite end of which bears on the inner end of the elbow 52. The shoulder 58 on the lower end of the sleeve 56 is cut away at 59 as shown in Figure 4 to reduce the bearing surface and prevent trapping of air.

In the form of construction shown in Figure 6, the valve housing 61 is screwed into the cylinder member, the housing being pro-.

vided with the squared lug 62 for this purpose. The valve carrier 63 is X-shaped in cross section and is provided with lower lugs 64 and upper lugs 65. The sleeve valve 66 is retained between the two sets of lugs. The valve carrier and valve are normally forced out of the housing by the spring 66', the outward movement being limited by the engagement of the lugs with the shoulder 67 on the cylinder member. The inner surface of the housing 61 is provided with the cleaning grooves 68.

The form of construction shown in Figure 7 comprises the fixed valve member 71 which is screwed into the cylinder member. The, sleeve valve 72 is fitted upon the outside of the member 71 and is urged outwardly by the spring 73 which bears against the cylinder member and the shoulder 74 on the sleeve valve. The poppet check member 75 engages the inner shoulder 76 of the sleeve valve to,

limit its outward movement. The stem 77 of the check 75 extends through the valve memher or cage 71 and carries the cushioning spring 78 retained in place by nut 79. The cage 71 isprovided with the lateral openings 80 and the openings 81 in its upper portion. The sleeve 72 is notched at 82 on its upper edge to permit passage of air.

The form of construction shown in Figure 8 comprises a cage 85 threaded into the cylinder member, the spider 86 in the cage carrying the valve stem 87. The double spring head 88 is carried at the upper end of the stem 87 and the upper end 89 of the stem is of such length as to seat the valve on the seat 90 when the valve is depressed by the piston. The spring 91 encircles the stem 87 and normally urges the valve outward.

In the operation of the riveter, suitable dies are placed in the die holders 12 and 31. If it is desired to carry out a punching operation, the stripper 33 is left in place. If it is desired to use the device for riveting, the stripper is removed by removing the bolt 34. With the parts in the position shown in Figure 1 air is introduced through the open- 'ing in elbow 52 at the upper end of the cylinder and passes through the sleeve 56 and the ports 55 past the spring valve 53 upon the upper side of the follower 43. The air passing against the follower causes the pistonto move downin the cylinder and the connection between the piston rod and lever 16 causes the latter to rock in the clockwise direction about the pivot 18. The cylinder in the meantime rocks in the counter-clockwise direction about its pivot 36. As the lever 16 rocks in the clockwise direction the plunger 21 is drawn upwardly in its bearings by the connection afforded by the bolts 25 and 26 and links 27 and 28.

As the piston reaches the lower end of its stroke its movement is cushioned by the lower face of the piston engaging the sleeve 56 and forcing it down against the spring 57. As the sleeve moves into the bore in the member 51, the lateral air passages 55 are closed and the air passage through the sleeve is closed by the piston 40. Thus at the end of the stroke the air escapes slowly and the movement of the piston is cushioned.

The valve shown in Figure 6 operates in a similar manner. The carrier 63 when engaged by the piston moves down and carries the sprin valve 66 opposite the ports 69 thus closing 0 the discharge of air and cushioning the end of the stroke. In the reverse operation the air under pressure will force the spring valve 66 inwardly sufliciently to start the stroke and early in the stroke the valve 66 clears the ports 69.

The valve shown in Figure 7 operates in a manner similar to that of Figure 3. The sleeve closes the side ports and the trapped air is let out slowly through the notches 82 and ports81. The check member 75 minimizes the shock as the sleeve rises. In the valve shown in Figure 8 the air passage space is restricted as soon as the valve 88 enters the recess in the piston head.

To give an operating stroke to the dies, air under pressure is admitted to the lower end of the cylinder and the piston forced upwardly. This causes the lever 16 to rock in the counter-clockwise direction about its pivot. During this movement the bearing 20 thrusts against the toggle 29 and the latter thrusts against the bearing 24 carried by the plunger 21, forcing the latter downwardly. By means of the toggle and lever connections of the form shown the initial movement of the plunger is rapid and it is slowed up and carried forward at a slower uniform speed for the latter part of the stroke. This enables the maximum pressure to be exerted uniformly for a movement at the end .of the stroke where this is desirable.

The packing in the cylinder can be adjusted while the air pressure is on the cylin-' der by adjusting the nut 47. This permits the lightest possible adjustment which will hold the air and minimizes the friction losses I in the operation of the cylinder.

The several forms of cushioning valves shown have balanced movable ports which are light in weight and consequently the inertia is low. The free exhaust is stopped early and the cushioning stroke substantially equals the valve stroke. The valve parts are so mounted as to be readily removable from the cylinder for adjustment or repair and the mounting requires no precision machining of the cylinder. The wearing parts are cheap and easily replaceable. When piping.

The apparatus shown is adaptable for a wide variety of uses and can be mounted in an upright position for punching operations and for riveting when the rivets can be struck from the bottom. When rivets are to be struck from the top and work cannot move with the live die, the machine can be cradled in an inverted position. It may be mounted on a fixed support with dies vertical, or arranged for portable use with dies vertical or horizontal.

The frame bushings for the plunger,-the cylindrical bearings in the plunger and main lever and the toggle may be readily removed and replaced when necessary.

While I have shown certain preferred forms of construction by way of example it is to be understood that I contemplate such further changes and modifications as come within the spirit and scope of the accompanying claims.

I claim:

1. In combination with a cylinder and a movable piston therein, a port in an end of the cylinder, a fixed hollow valve member secured in said port, a movable valve carried by the fixed member, and a check valve carried by the fixed-member within the port.

2. In combination with a cylinder and a movable piston therein, a port in an end of the cylinder, a fixed hollow valve sleeve secured in said port, a movable valve carried by the fixed sleeve, aportion of said sleeve being spaced from the port, openings through said spaced portion, and valve means coacting with said openings.

3. In combination with a cylinder and a movable piston therein, a port in an end of thecylinder, a fixed-hollow valve sleeve secured in said port, a movable valve carried by the fixed sleeve, a portion of said sleeve being' spaced from the port, openings through said spaced portion, and a split spring ring carried by the fixed sleeveand coacting with said openings. p

4. In combination with a cylinder and a movable piston therein, a port in an end of the cylinder, a fixed hollow valve sleeve secured in said port, a movable valve carried by the fixed sleeve, a portion of said sleeve being spaced from the port, openings through said spaced portion, and a split spring ring carried externally by the sleeve and fitted over said openings to prevent passage inward through the openings and yieldingly permit passage outward through the openings.

5. In combination with a cylinder and a movable piston therein, a port in an end of the cylinder,'a fixed valve sleeve secured in said port, a portion of said sleeve being spaced from the port, openings through said spaced portion, valve means for said openings, a

sleeve valve fitted axially in said fixed sleeve, and spring means normally urging the sleeve valve into the cylinder.

6. In combination with a cylinder and a movable piston therein, a port in an end of p the cylinder, a fixed valve sleeve secured in said port, a portion of said sleeve being spaced from the port, openings through saidspaced portion, valve means for said openings, an inturned shoulder in said fixed sleeve, a slidable sleeve fitted into said fixed sleeve, :1. shoulderon the slidable sleeve adapted to engage the shoulder on the fixed sleeve, and springs means urging the slidable sleeve to cause said shoulder to contact.

7 In combination with a cylinder and a movable piston therein, a, port in an end of the cylinder, a fixed valve sleeve secured in said port, a portion of said sleeve being spaced from the port, openings through said spaced portion, valve means for said openings, an inturned shoulder in said fixed sleeve, a slidable sleeve fitted into said fixed sleeve, a shoulder on the slidable sleeve adapted to engage the shoulder on the fixed sleeve, portions of the slidable sleeve being cut away to prevent trapping of air between the shoulders, and spring means urging the slidable sleeve to cause said shoulders to contact.

Signed at Chicago, Illinois, this 10th day of December, 1925.

JOHN C. HANNA. 

